This paper is a literature review of the theories of Intercultural Adaptation. The theory was included in the study Intercultural Communication (KAB). Adaptation is a problem that needs to be solved when a person or group of people communicate with others from different cultures. Cross-cultural adaptation process is an interactive process that evolves through communication activities between individual entrants with new socio-cultural environment. This paper uses a qualitative approach with descriptive analysis method. Through a case study, this paper presents how the theories of inter-cultural adaptations are implemented in the pattern of intercultural communication in everyday life when someone does adaptation, especially with a different culture from them. In this paper described five inter-cultural adaptation theory, namely Integrative Communication Theory, Anxiety / Uncertainty Management Theory, Uncertainty Reduction Theory, Theory of Acculturation and Culture Shock, and Co-cultural Theory. Theories of Intercultural Adaptation explains that adaptation is a collaboration of migrants effort and local environmental acceptance. Achieving maximum intercultural adaptation is when each individual entrants and individual local culture accept their culture of each other.